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H8-00

H8-00 — OU: Malfunction of compressor input (CT) system

Daikin · ASHP Error Codes

What does H8-00 mean?

There is a malfunction related to the compressor's current transformer (CT) system in the outdoor unit (OU).

Common Causes

  • Faulty CT sensor
  • Wiring issues
  • Control board malfunction

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all electrical connections related to the compressor CT system.

  2. 2

    Ensure the unit is properly grounded.

  3. 3

    Power cycle the unit.

  4. 4

    A technician must diagnose and repair the CT system.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

7H-017H-01 — Water flow problem7H-047H-04 — Water flow problem during domestic hot water production7H-057H-05 — Water flow problem during heating/sampling
Source: Daikin ASHP Error Codes
Open Manual (Page 3)Search more codes in this manual